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/*
* Copyright (C) 2016 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
"use strict";
class StackSlot {
constructor(index, byteSize, kind)
{
this._index = index;
this._byteSize = byteSize;
this._kind = kind;
}
get byteSize() { return this._byteSize; }
get kind() { return this._kind; }
get isLocked() { return this._kind == Locked; }
get isSpill() { return this._kind == Spill; }
get index() { return this._index; }
ensureSize(size)
{
if (this._offsetFromFP)
throw new Error("Stack slot already allocated");
this._byteSize = Math.max(this._byteSize, size);
}
get alignment()
{
if (this._byteSize <= 1)
return 1;
if (this._byteSize <= 2)
return 2;
if (this._byteSize <= 4)
return 4;
return 8;
}
get offsetFromFP() { return this._offsetFromFP; }
setOffsetFromFP(value) { this._offsetFromFP = value; }
hash()
{
return ((this._kind == Spill ? 1 : 0) + this._byteSize * 3 + (this._offsetFromFP ? this._offsetFromFP * 7 : 0)) >>> 0;
}
toString()
{
return "" + (this.isSpill ? "spill" : "stack") + this._index + "<" + this._byteSize +
(this._offsetFromFP ? ", offset = " + this._offsetFromFP : "") + ">";
}
static extract(arg)
{
if (arg.isStack)
return arg.stackSlot;
return null;
}
static forEachFast(arg, func)
{
if (!arg.isStack)
return;
let replacement;
if (replacement = func(arg.stackSlot))
return Arg.createStack(replacement, this._offset);
}
static forEach(arg, role, type, width, func)
{
if (!arg.isStack)
return;
let replacement;
if (replacement = func(arg.stackSlot, role, type, width))
return Arg.createStack(replacement, this._offset);
}
}